Sandra Bullock has lavished praise on the crew behind Alfonso Cuaron’s new space film “Gravity” for turning a studio back-lot into a children’s “wonderland” so her young son could have fun while she was at work.

The survival project was one of the first the actress signed up for following the 2010 breakdown of her marriage to cheating ex Jesse James and the adoption of her baby boy Louis, and she made it clear to producers that keeping her son safe and happy was her number one priority.

She tells Us Weekly, “I can’t selfishly take journeys anymore because I have to take a little boy along with me.

“I said (to producers) … make it so I’m not somewhere not paying attention because I’m so worried about, ‘Where is he? Is he having fun? Is this a good life experience?’

“(Producer) David (Heyman) turned a back lot of a sound stage in rainy London into a wonderland for a 1-and-a-half-year-old. Everything was bumper guarded! People go, ‘What is that?’ And I go, ‘That is to protect a child’s head! All of it!’”

Bullock admits she hugged her baby a little tighter each night after spending hours shooting in isolation, portraying a medical engineer who has lost a child on a space shuttle mission gone wrong.

She adds, “I kept having to say, ‘What would I do (if I lost a child)?’ and I realized I might be far worse off than she is. You just have to go there and know at the end of the day, you can unplug and go home and do something a lot of … people who were parents can’t.”